The National Instruments 781215-01 RF Analog Signal Generator, also known as the PXI‑5650, is a sophisticated instrument engineered for continuous wave signal generation across a broad frequency range of 500 kHz to 1.3 GHz. This device excels in modulation capabilities, supporting Frequency Modulation (FM), 2-Frequency Shift Keying (2-FSK), and On Off Keying (OOK), which allows it to generate both analog and digitally modulated signals tailored for various testing needs. Utilizing advanced Direct Digital Synthesis (DDS) technology, the generator achieves high-resolution frequency hopping and phase continuity during sweeping, making it ideal for applications including device characterization, bit error rate testing, and antenna testing.

The 781215-01 features an impressive frequency resolution of less than 3 Hz and offers an amplitude range from -90 dBm to 10 dBm with a resolution of less than 0.1 dB. It demonstrates fast amplitude settling times, typically within 0.05 dB of the final value in under 500 ms. Signal integrity is a priority, as the generator provides an exceptional signal-to-noise ratio, often below -140 dBc/Hz at output powers of 0 dBm or higher, and maintains a low Voltage Standing Wave Ratio (VSWR) of less than 1.8:1.

The unit includes an internal reference clock with an initial accuracy of ±3 ppm and features a capability for an external reference input frequency of 10 MHz, which can achieve lock times of under 1 second. This flexibility facilitates seamless integration with external timing systems. The generator also ensures excellent spectral purity, featuring Single Sideband (SSB) phase noise as low as -111 dBc/Hz at 100 MHz.

With support for multiple waveform types in FM modulation—sine, triangle, and square—and a maximum frequency deviation range from 500 kHz to 2 MHz, the device caters to a variety of communication protocols with ease.

Compactly designed to fit into a single PXI Express slot and built to endure operational temperatures from 0 °C to 55 °C, as well as storage temperatures down to -40 °C, the 781215-01 meets stringent safety and electromagnetic compatibility standards, ensuring reliable performance in diverse industrial and laboratory settings. This RF Analog Signal Generator is an essential tool for professionals requiring high performance and versatility in their testing and measurement tasks.

The device measures 2.0 cm × 13.0 cm × 21.6 cm (0.8 in × 5.1 in × 8.5 in) and weighs 415 g (14.6 oz), with a warranty period of 2 to 3 years.